January 2002

Columns

HP Reliability: Consider overspeed protection retrofits

The overwhelming majority of small turbine overspeed trip devices are mechanical; they incorporate a spring-activated trip bolt that moves out and contacts a trip lever whenever a pres..

Bloch, Heinz P., Hydrocarbon Processing Staff

The overwhelming majority of small turbine overspeed trip devices are mechanical; they incorporate a spring-activated trip bolt that moves out and contacts a trip lever whenever a preset overspeed is reached. A number of factors make it necessary to check, and possibly recalibrate, these built-in devices yearly. Needless to say, process plants are not always performing this preventive maintenance activity in a timely and procedurally correct fashion. Unscheduled downtime events and serious injury, even deaths, have resulted from such oversights. Well-engineered and highly reliable electronic overspeed prevention (OSP)

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